A federal air marshal was arrested on Thursday for using his cell phone to take photos up women’s skirts.

Adam Bartsch, a 28-year-old air marshal, was allegedly on duty during the boarding of a Southwest Airlines flight at Nashville International Airport when a witness spotted him taking photos up women’s skirts. Bartsch was arrested, and according to a police report had taken 10 to 12 photos. He told authorities he had done it before.

According to CNN, Bartsch was charged with disorderly conduct and held on $10,000 bail. The Transportation Security Administration said it was in the process of suspending or terminating Bartsch’s employment.